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Influence of corner geometry on the secondary flow in turbulent square ducts
KTH, School of Engineering Sciences (SCI), Mechanics, Stability, Transition and Control. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, Centres, SeRC - Swedish e-Science Research Centre.
KTH, School of Engineering Sciences (SCI), Mechanics, Stability, Transition and Control. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, Centres, SeRC - Swedish e-Science Research Centre.
2017 (English)In: International Journal of Heat and Fluid Flow, ISSN 0142-727X, E-ISSN 1879-2278, Vol. 67, 69-78 p.Article in journal (Refereed) Published
Abstract [en]

Direct numerical simulations of fully-developed turbulent flow through a straight square duct with increasing corner rounding radius r were performed to study the influence of corner geometry on the secondary flow. Unexpectedly, the increased rounding of the corners from r=0 to 0.75 does not lead to a monotonic trend towards the pipe case of r=1. Instead, the secondary vortices relocate close to the region of wall-curvature change. This behavior is connected to the inhomogeneous interaction between near-wall bursting events, which are further characterized in this work with the definition of their local preferential direction. We compare our results with those obtained for the flow through a square duct (which corresponds to r=0) and through a round pipe (r=1), focusing on the influence of r on the wall-shear stress distribution and the turbulence statistics along the centerplane and the corner bisector. The former shows that high-speed streaks are preferentially located near the transition between straight and curved surfaces. The Reynolds numbers based on the centerplane friction velocity and duct half-height are Reτ, c ≃ 180 and 350 for the cases under study.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 67, 69-78 p.
Keyword [en]
Corner geometry, Direct numerical simulation, Secondary motions, Turbulent duct flow, Wall-bounded turbulence
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-212223DOI: 10.1016/j.ijheatfluidflow.2017.07.009ISI: 000413389800006Scopus ID: 2-s2.0-85026376710OAI: oai:DiVA.org:kth-212223DiVA: diva2:1134218
Funder
Swedish e‐Science Research CenterSwedish Research CouncilKnut and Alice Wallenberg Foundation
Note

QC 20170818

”Correction in ”International Journal of Heat and Fluid Flow, vol. 67, issue. B, page. 94-103. Doi: 10.1016/j.ijheatfluidflow.2017.09.011, WOS: 000415776500010

Available from: 2017-08-18 Created: 2017-08-18 Last updated: 2017-12-11Bibliographically approved

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